ClassNotFoundException when working with Template
Newbie here,
I am working on a Win2K system with the jboss-3.0.0_tomcat-4.0.3 package, and am trying to build a simple test case in the Template. It seems that I am getting an incomplete .jar file, which does not contain my classes, and I would greatly appreciate any explanation of what I am doing wrong. JBoss.3.0QuickStart.Draft3.pdf says:
"Most likely you want to add you own package structure and that is not a problem because under “/main/client”, “/main/ejb” or “/main/servlet” you can use any directory structure you like but must not add client code to another directory than “/main/client” and the same applies for EJBs and servlets."
So, under the \main\ejb directory, I created com\pc\session\utility. In the utility directory, I have a class called SequenceGeneratorBean.java (code below). Additionally, under the \main\client directory I created com\pc, and in the pc directory I created a class called TestClient.java (code below). I modified the ant.properties file to reflect that I am using Cloudscape as my data source, and to specify the location of my servlet jar file, as follows:
# Set the DB type mapping (Hypersonic SQL, PostgreSQL etc., see XDoclet's attribute "typemapping")
type.mapping=Cloudscape SQL
# Set the DataSource name your are going to use (java:/DefaultDS etc., see XDoclet's attribute "datasource")
datasource.name=java:/CloudscapeDS
# Uncomment this and adjust the path to point directly to JAR file containing the servlet classes
# Attention: By uncommenting this line you start the creation of a WAR file
servlet-lib.path=C:/Java/jboss/jboss-3.0.0_tomcat-4.0.3/server/all/lib/javax.servlet.jar
When I ran ant, everything seemed to go OK (see ant output, below). However, in the JBoss monitor window, I got the following errors:
***************************
09:50:28,323 INFO [EJBDeployer]
Bean : com/pc/session/utility/SequenceGenerator
Section: 22.2
Warning: The Bean Provider must specify the fully-qualified name of the Java class that implements the enterprise bean's business methods in the <ejb-class> element.
Info : Class not found: com.pc.session.utility.SequenceGeneratorBean
[... ]
09:50:28,553 ERROR [EjbModule] Initialization failed
java.lang.ClassNotFoundException: com.pc.session.utility.SequenceGeneratorHome
at java.net.URLClassLoader$1.run(URLClassLoader.java:198)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[I can provide additional tracing information and additional errors which follow, if it would be helpful.]
***************************
When I ran the run-client.bat script modified to execute com.pc.TestClient, I also got "java.lang.NoClassDefFoundError: com/pc/TestClient"
The only two jar files created when I ran ant were ejb-test.jar and web-client.war. When I un-jarred ejb-test.jar, I found none of the com.pc package anywhere.
Obviously, I am missing something -- there must be more to coding in the template than just adding subdirectories and creating classes, but I can't seem to find any more detailed documentation. I would be very grateful for any assistance.
Thanks,
-- Rick
SequenceGeneratorBean.java:
***************************
package com.pc.session.utility;
import java.rmi.*;
import javax.ejb.*;
import java.util.*;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
/**
* Encapsulates the retrival of DB data
*
* @author John Snyder
* @version $Revision: 1.1 $
*
* @ejb:bean name="com/pc/session/utility/SequenceGenerator"
* display-name="Generates unique Identifier for an Entity"
* type="Stateless"
* jndi-name="ejb/com/pc/session/utility/SequenceGenerator"
* @ejb:env-entry name="DataSource_Name"
* value="CloudscapeDS"
* @ejb:resource_ref res-name="jdbc/CloudscapeDS"
*/
public class SequenceGeneratorBean implements SessionBean
{
// for testing
String status = "unset";
public String getStatus() { return status; }
// Members
private SessionContext context;
// Work Methods
/**
* Delivers the next sequence number from the given table
*
* @param entityTableName Name of the table for which the next primary key is needed
* @param pkFieldName Name of the primary key field
*
* @return Next sequence number
*
* @throws RemoteException
*
* @ejb:interface-method view-type="remote"
* @ejb:transaction type="Mandatory"
**/
public int getNextNumber(String entityTableName, String pkFieldName) throws SQLException, NamingException
{
//local Connection
Connection con = null;
try
{
con = getConnection("java:/CloudscapeDS");
int nextNumber = -1;
String getNextNumberSQL = "SELECT max("+pkFieldName+") FROM "+entityTableName;
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(getNextNumberSQL);
// should always be one
if (rs.next())
nextNumber = 1 + rs.getInt(1);
rs.close();
stmt.close();
return nextNumber;
}
catch (SQLException sqle)
{throw new SQLException("Unable to generate new ID: "+sqle);}
finally
{
try { con.close(); con=null; } catch (Exception ignore) {status += "\n local connection NOT closed in getNextNumber."; }
}
}
// Utility Methods
protected Connection getConnection() throws SQLException, NamingException
{
// default DB is Cloudscape
return getConnection("java:/CloudscapeDS");
}
protected Connection getConnection(String dataSourceJndiName) throws SQLException, NamingException
{
// get a reference to the naming service
InitialContext context = new InitialContext();
// get a data source for the database
DataSource ds = (DataSource) context.lookup(dataSourceJndiName);
// have the datasource allocate a database connection
return ds.getConnection();
}
// EJB Required Methods
/* EJB must have public, parameterless constructor */
public SequenceGeneratorBean() { }
/**
* Create the Session Bean
*
* @throws CreateException
*
* @ejb:create-method view-type="remote"
**/
public void ejbCreate() throws CreateException { }
public void setSessionContext (SessionContext aContext) { context = aContext; }
public void ejbActivate() { }
public void ejbPassivate() { }
public void ejbRemove() { }
}
***************************
TestClient.java:
***************************
package com.pc;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import com.pc.session.utility.SequenceGenerator;
import com.pc.session.utility.SequenceGeneratorHome;
public class TestClient {
public static void main(String[] args){
try {
InitialContext lContext = new InitialContext();
SequenceGeneratorHome sgHome = (SequenceGeneratorHome) lContext.lookup( "ejb/com/pc/session/utility/SequenceGenerator" );
SequenceGenerator sg = sgHome.create();
// Get the next pk for the Person table
int id = sg.getNextNumber("PERSON", "PERSON_ID");
System.out.println( "Next primary key is: " + id );
sg.remove();
} catch( Exception e ){
e.printStackTrace();
}
}
}
***************************
ant output:
***************************
Buildfile: build.xml
check-environment:
check-jboss:
wrong-jboss:
check-xdoclet:
wrong-xdoclet:
init:
[echo] build.compiler = ${build.compiler}
[echo] user.home = C:\Documents and Settings\John Snyder
[echo] java.home = C:\Java\j2sdk1.4.0_02\jre
[echo] ant.home = C:\ant\jakarta-ant-1.5\bin\\..
[echo] jboss.home = C:/Java/jboss/jboss-3.0.0_tomcat-4.0.3
[echo] xdoclet.home = C:/Java/jboss/xdoclet1.1.2
[echo] java.class.path = C:\Java\j2sdk1.4.0_02\lib\tools.jar;C:\ant\jakarta-ant-1.5\bin\\..\lib\xml-apis.jar;C:\ant\jakarta-ant-1.5\bin\\..\lib\xercesImpl.jar;C:\ant\jakarta-ant-1.5\bin\\..\lib\optional.jar;C:\ant\jakarta-ant-1.5\bin\\..\lib\ant.jar;
xdoclet-generate:
[ejbdoclet] Generating Javadoc
[ejbdoclet] Javadoc execution
[ejbdoclet] Loading source file C:\Java\jboss\template\src\main\ejb\test\session\SequenceGeneratorBean.java...
[ejbdoclet] Loading source file C:\Java\jboss\template\src\main\ejb\test\session\TestSessionBean.java...
[ejbdoclet] Loading source file C:\Java\jboss\template\src\main\ejb\test\message\TestMessageDrivenBean.java...
[ejbdoclet] Loading source file C:\Java\jboss\template\src\main\ejb\test\entity\TestBMPEntityBean.java...
[ejbdoclet] Loading source file C:\Java\jboss\template\src\main\ejb\test\entity\TestEntityBean.java...
[ejbdoclet] Loading source file C:\Java\jboss\template\src\main\ejb\com\pc\session\utility\SequenceGeneratorBean.java...
[ejbdoclet] Constructing Javadoc information...
[ejbdoclet] Running
[ejbdoclet] Running
[ejbdoclet] Running
[ejbdoclet] Running
[ejbdoclet] Running
[ejbdoclet] Running
[ejbdoclet] Running
[ejbdoclet] Running
compile:
jar:
compile-web:
war:
deploy-server:
[copy] Copying 2 files to C:\Java\jboss\jboss-3.0.0_tomcat-4.0.3\server\default\deploy
create-client:
[echo] JBoss Home on Unix: C:/Java/jboss/jboss-3.0.0_tomcat-4.0.3
[echo] Java Home on Unix: C:/Java/j2sdk1.4.0_02/jre
main:
BUILD SUCCESSFUL
Total time: 7 seconds